[编程入门]求和训练-题解（Python代码）

解题思路: 使用 for循环 和while循环两种方法

注意事项:

参考代码:

for 循环：

a,b,c = map(int,input().strip().split())

sum1=Sn=fn=0

for i in range(1,a+1):

    sum1 = sum1 + i

for j in range(1,b+1):

    Sn = Sn + j**2

for k in range(1,c+1):

    fn = fn + 1/k

print(sum1 + Sn + eval("{:.2f}".format(fn)))

while循环：

a,b,c = map(int,input().strip().split())

sum1=Sn=fn=0

s1=s2=s3 = 1

while s1+s2+s3<=a+b+c:

    while s1 <= a:

        sum1 += s1

        s1 += 1

    while s2 <= b:

        Sn += s2**2

        s2 += 1

    while s3 <= c:

        fn += 1/s3

        s3 += 1

print(sum1+Sn+eval("{:.2f}".format(fn)))